Did you both agree to confirm on the day and the method?
Yes - I don't want or encourage advance bookings, but in the event that I have one then it has to be confirmed by phone or text first thing on the day and I make sure this is understood.
However your post reads as if you texted or called this man out of the blue at a time which had not been previously agreed and I would never contact them like this. Like GG, if they don't confirm, they're automatically cancelled and somebody else gets the slot - he sounds like a bit of a dick, but I can't see what he's done to deserve a negative feedback (or any feedback) given that leaving this may do other women out of some money if they're daft enough to take it seriously, and we know from posts here some do?
Does he have his misses monitoring the phone?
She might or might not be and he may not even know if she is - it's none of your business. He also could have just gone for a piss and left his phone on the kitchen table when your 'message' (and it sounds as if you're talking about a text rather than an email, despite your posts being vague) arrived. I agree that a confirmation procedure is vital, but it's for them to contact us, not the other way round.